Car-brake.



F. M. BLAKE.

GAR BRAKE.

APPLICATION FILED APR.27,1908.

1,001,499. 7' Patented Aug. 22, 1911.

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4i iorney if N 1TB tl @TATE@ PAENT ftllftl it.

FRANCIS M. BLAKE, OF VIORCESTER, MASSACHUSETTS, ASSIGNOR OF ONE'HALF TO ERNEST F. DAKIN, OF VIORCESTER, IZIASSAGHUSETTS.

CAR-BRAKE Specification of Letters Patent.

Application filed April 27, 1908.

Patented Aug. 22, 1911.

Serial No. 429,570.

T 0 all whom it may concern:

Be it known that l, FRANCIS M. Bonita, a citizen of the United States, residing at: Worcester, in the county of \Vorcester and Commonwealth of h'lassaehusetts, have invented a new and useful lmprovement in Car Brakes, of which the following is a specification, accompanied by drawings forn'iing a part of the same, in which-- Figure 1 represents a side elevation of a car truck, having a portion of the car broken away to more clearly disclose the application of my improved brake to one of the car wheels, the brake being shown in its inoperative position. Fig. 9 represents a side view of a car wheel showing a portion of the track and framework of the truck with one of my improved brakes, having one of the brake shoes in operative position as applied when the car wheel is rotating in the direction of the arrow, and l ig. 3 is a similar view showing the application of the brake when the car wheel is rotating in the opposite direction.

Similar reference letters and figures refer to similar parts in the different views.

My invention relates to that class of ca 1' brakes in which a brake shoe is applied to the track, and it has for its objects to utilize the momentum of the car and secure a more efficient contact between the brake shoe and the rail; to cause the brake shoe to act as a safety guard in front of the rail and to simplify the construction of this class of brakes.

I accomplish the above objects by means of the construction and arrangement of parts as hereinafter described and pointed out in the annexed claims.

Referring to the accompanying drawings 1 denotes a car wheel, 2 a portion of the framework forming the supporting truck and 3 one of the rails of the track. Applied to the rail 3 on opposite sides of the car wheel are a pair of brake shoes t and 5 for integral arms 6 and 7, extending upward on each side of the tread 8 of the car wheel. with their upper ends pivotally connected by links 9 and 10 with the arms '11 and '12 of a three armed lever 13, pivoted at 1 L upon the truck and having its third arm '15 pivoted to an operating rod 16, which is connected with any suitable actuating mecha nism whereby the three armed lever 13 may be rocked at will. In the present instance,

the rod 16 is representml in Fig. l as connccted with a crank plate 17 on the lower end of a vertical sh: ft 18, to the upper end of which may be applied a hand wheel or. as shown, a crank lever '11). The brake shoes 4- and 5 are pivot ally connected at the base of the upright arms (3 and 7 by means of a link 20. The brake shoes l and 5 are, therefore. suspended loosely from the arms 11 and 12 of the three armed lever 13. which is pivoted directly above the axis of the wheel so that the brake shoes will hang upon oppositc sides of the wheel and, in their normal position. held out of contact with the tread of the wheel by means of the link ln the normal or inoperative position of the brake, th 2 arms '11 and 1:2 of the thrcarmed lever 13 are maintained in a horizontal position with each of the brake shoes suspcmlcd tlrcrefrmn, with their lower or contacting surfaces horizontal and slightl t' raised above the upper surface of the rail as represented in Fig. 1.

In their normal position each of the brake shoes is not only out of contact with the ail. but they are nrevcntml from exercising any undue friction upon the tread of the wheel by means of the link 20. The inner corners of each of the brake shoes extend beneath the periphery of the wheel into the triangular spaces incloscd between the tread of the wheel and the upper surfaces of the rail. If it is desired to apply the brake while the car wheel is rotating in the direction of the arrow shown in Fig. 2, the three armed lever 13 is rocked to depress the arm 11 and raise the arm 19.. which carries the brake shoe 4, against the track in front of the wheel, with its inner corner 21 wedged between the tread of the wheel and the rail so, that in addition to the force applied to the shoe 1; by rocking the three armed lever 13. the shoe will also be crowded against the rail by the rotating wheel so that the momentum of the car tends to check its movement. lf, on the other hand, the wheel is rotated in the direction of the arrow shown in Fig. 3, then the brake is applied by depressing the arm 12 and elevating the arm 11 of the three armed shoe 4 to be raised and the brake shoe 5 to become wedged between the wheel and rail with similar result. The rocking of the three armed lever in either direction, therefore, carries one or the other of the shoes lever, causing the brake into frictional contact with the rail, while the opposite or raised shoe will be brought out of contact with the periphery of the wheel, for example, when the shoe 4 is carried against the rail, as shown in Fig. 2, the shoe 5 will be lifted and carried out of frictional contact with the tread of the wheel, so that a retarding effect is secured by the pressure of one brake shoe against the rail while wedged against the wheel. While the brake shoes are held in their normal or inoperative position, or when the wheel is rotating in the direction indicated in Fig. 2, the brake shoe 4 serves as a safety guard in front of the wheel to prevent objects from passing beneath the wheel. Similarly, the brake shoe 5 serves as a guard when in its normal position, or when the wheel is rotating in the direction indicated in Fig. 3.

I claim,

1. In a car brake, the combination with a car wheel, of a pair of brake shoes on opposite sides of the tread of said wheel, means for pivotally suspending each of said shoes from a single point above the wheel, and

means for depressing either of said shoes arms, brake shoes suspended from said links on opposite sides of the wheel, a spacing j link between said shoes, and means for rocking said lever.

3. A brake for a car wheel comprising a brake shoe suspended 1n front of the wheel from a pivot directly above the wheel, said brake shoe normally held out of contact with said wheel and track, and means for lowering said shoe into contact with the A track and for exerting a downward pressure from said pivot upon said shoe to hold it in frictional contact with said track before said shoe is in contact with said wheel.

4.. A brake for a car wheel comprising a brake shoe pivotally suspended in front of the wheel, means for holding said shoe normally out of contact with the Wheel and track, and means for exerting at will a suflicient downward pressure upon said shoe to hold it in frictional contact with the track and check the forward movement of said shoe to bring it into contact with the wheel.

5. A brake for a car wheel comprising a pair of brake shoes pivotally suspended on opposite sides of the wheel and abo-ve'the track, a rod parallel with the track, leversconnecting said rod and said brake shoes arranged to hold said brake shoes normally out of contact with said wheel and track,

rod to lower'one of said brake shoes into contact wlth the track and to exert a downward pressure upon it before it is in contact and by the longitudinal movement of said Qj with the wheel and at the same time to raise i the other brake shoe.

Witnesses PENELOPE COMBERBACH, HENRY Woon FOWLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

